SOURCE: 2004 GMC Envoy has trouble idling
Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.
SOURCE: where is coolant temp sensor located on 2003 gmc
heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.
SOURCE: 2003 GMC Envoy code P1345
P1345 "Camshaft To Crankshaft Position Correlation Fault"
Maybe a sensor ( camshaft or crankshaft position) is failing or has a bad connection at the plug.
Check both the camshaft and crankshaft sensors:--
The camshaft Position sensor (CMP) Is located on the front of head, directly above the belt. Small bolt holds it in, and it is a round sensor. If any belt maintance was done recently, Look for the sensor to have been damaged. It is the electrical connector that is EASILY damaged by a ratchet when turning the belt tensioner to remove belt.
camshaft position sensor, Don't forget to remove and clean the camshaft position solenoid.
908 is the sensor 421 is the Solonoid. click on the link directly :-- http://www.compnine.com/largeimg/060425TS00-402.gif
The one on the front of the block is easy to replace and the cam position sensor actuator solenoid is on the side. To replace the one on the side, where you may also find oil in the electrical connector, the serpentine belt must come off and the power streering pump must be loosened by inserting a socket through the holes in the pulley where there are three bolts.
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The crank sensor is located on the drivers side rear of engine just below the starter.
Check both this sensors.clean the sensors and refit it and check.If still the same error code 1345 then its either the faulty sensor or timing issue.The timing belt needs to be rechecked.
Also the camshaft position sensor code may have set because of the low oil pressure to the variable timing system from low oil in the motor.
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SOURCE: my speedometer does not work on my GMC envoy
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Envoy instrument cluster repair
SOURCE: license plate light out on
Has 2 screws for the cover, take them out and replace the bulb/s. Might check the seal that seals the entire license plate panel, it's black. Common problem is that this seal comes folded under from the factory and allows water into the bulb area.
S&T Series Blazer, Bravada, Envoy, Jimmy, Rainier, Trailblazer, Xtreme
Throttle Position Sensor (TPS)
Removal & Installation
Fig. Detaching electrical connectors prior to TP sensor removal
Fig. Identifying components for removal of the TP Sensor
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I don't have any vacuum leaks. The fuel pressure is good. It'll run with the original sensor. It hasn't completely failed yet but the brand new sensor it'll start up and start idling like the TPS is bad and then bogs down and dies. I ordered it from eBay I'm thinking it may be the wrong sensor. Is there any relearn procedures. I tried quite a few things in the last 2 hours well what I've read online anyway
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